Eurotherm 2604/2704 Owner's manual

Type
Owner's manual

This manual is also suitable for

Eurotherm 2604/2704 is a versatile controller designed for environmental chambers, offering precise control of temperature, humidity, and altitude simulation. Its key features include synchronized setpoint profiles, %RH & dewpoint measurement, altitude compensation, compressor timer, and the ability to integrate with solid-state humidity sensors.

Eurotherm 2604/2704 is a versatile controller designed for environmental chambers, offering precise control of temperature, humidity, and altitude simulation. Its key features include synchronized setpoint profiles, %RH & dewpoint measurement, altitude compensation, compressor timer, and the ability to integrate with solid-state humidity sensors.

The 2704/2604 is ideal for use in applications where it is necessary
to simulate the environmental conditions of temperature, humidity
and sometimes altitude. Control of these conditions require certain
unique features from a controller. Firstly, the controller needs to be
able to generate a setpoint profile. This feature allows the user to
predefine a series of setpoint changes. Secondly the controller
needs to be able to measure humidity using either the traditional
Wet/Dry bulb method or by interfacing to solid state sensors. The
controller may also be required to turn a refrigeration compressor on
and off, operate a bypass valve, and possibly operate two stages of
heating and/or cooling (see diagram below).
The 2704/2604 is able to provide these functions.
2704
2604
MODEL
Environmental chamber control
Humidity control supplement
Ideal for:
Reliability testing
Climatic simulation
Culture & plant growth
Simulated altitude
control
Features:
Synchronised setpoint
profiles
%RH & dewpoint
measurement
Altitude compensation
Compressor timer
Environmental chamber
Sprinklers
Vent
Vacuum
pump
Vent output
Pressure output
Heaters
Cooling
output
Temperature
Probe
De-humidify
Cooling
Pressure
Probe
Humidity Probe
Humidity output
De-humidify
output
T
P
H
abc
Humidity in a chamber is controlled by adding or removing
Water vapour. As with the temperature control loop, two control
outputs are required(i.e.Humidify and Dehumidify). The
humidity output regulates the amount of steam allowed into
the chamber, adding steam increases the humidity level. Water
vapour is added by either a boiler, evaporating pan or by direct
injection of atomised water.
· Evaporating pan of water warmed by a heater regulates
the humidity level by controlling the temperature of the
water.
· Atomisation system uses compressed air to spray water
vapour directly into the chamber. The same compressor
used for cooling the chamber accomplishes
dehumidification. Different sets of ‘heat’ exchanger coils are
used along with a different control valve.
Humidity control
Altitude is simulated by controlling the pressure inside the
chamber. Usually a vacuum is drawn to simulate high altitudes.
If the application requires simulating altitude at sea level and
the chamber is located at an altitude higher than sea level, then
the chamber must also be pressurised. Again, a two channel
output controller is required. Pressure varies nonlinearly with
altitude so the pressure signal must have a special linearisation
applied to it.
Altitude control
Typical environmental chamber controller
Another requirement of the controller is to be able to start and
stop the cooling compressor. To alleviate wear and tear caused
by cycling the compressor, the chamber controller will turn the
compressor on and leave it on whenever cooling or
dehumidification is required. The compressor will usually be
kept running for 5 to 15 minutes after cooling has stopped. If
the controller starts to call for cooling again the “compressor
timeout” timer deactivates until cooling is called for again.
Compressor control
Wet RTD
Dry RTD
Pressure
Run
Hold
Reset
Setpoint
Programmer
Humidity
Function
Block
Humidity
Control Loop
Compressor
Timer
Temperature
Control Loop
Altitude
Control Loop
Humidity
Dehumidity
Compressor Start
Heating
Cooling
Increase
Decrease
The temperature of the environmental chamber is controlled
via a single loop with two control outputs. The heating output
time proportions electric heaters, usually via a solid state relay.
The cooling output normally operates a refrigerant valve which
introduces cooling agents into the chamber. The 2704/2604 has
an advanced PID control algorithm which automatically
calculates when heating or cooling is required. Additional stages
of both heating and cooling can also be implemented if
required.
Temperature control
Part No. HA026748 Issue 1.1 Printed in England 01.01
EUROTHERM LIMITED http://www.eurotherm.co.uk email: [email protected]
© Copyright Eurotherm Controls Limited 2000
All rights strictly reserved. No part of this document may be stored in a retrieval system, or any form or by any means without prior written permission from Eurotherm
Controls Limited. Every effort has been taken to ensure the accuracy of this specification. However in order to maintain our technological lead we are continuously
improving our products which could, without notice, result in amendments or omissions to this specification. We cannot accept responsibility for damage, injury loss or
expenses resulting therefrom.
UK SALES OFFICE
Eurotherm Ltd
Faraday Close Durrington Worthing BN13 3PL United Kingdom
Sales and support: Tel. +44 (0)1903 695888 Fax +44 (0)1903 695666
Sales and support in over 30 countries worldwide
Enquiries/orders to:
Eurotherm Ltd Faraday Close Durrington
Worthing BN13 3PL United Kingdom
Tel. +44 (0)1903 268500 Fax +44 (0)1903 265982
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Eurotherm 2604/2704 Owner's manual

Type
Owner's manual
This manual is also suitable for

Eurotherm 2604/2704 is a versatile controller designed for environmental chambers, offering precise control of temperature, humidity, and altitude simulation. Its key features include synchronized setpoint profiles, %RH & dewpoint measurement, altitude compensation, compressor timer, and the ability to integrate with solid-state humidity sensors.

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